often 和 usually有什么区别?那个表示频率更高一些?It has sailed across the Atlantic many times .It has sailed across the Atlantic___[A]often[B]usually选A,但B为什么不行?ps:shall表示将来时,可以用在 A and B 后面么.我知

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often 和 usually有什么区别?那个表示频率更高一些?It has sailed across the Atlantic many times .It has sailed across the Atlantic___[A]often[B]usually选A,但B为什么不行?ps:shall表示将来时,可以用在 A and B 后面么.我知
often 和 usually有什么区别?那个表示频率更高一些?
It has sailed across the Atlantic many times .It has sailed across the Atlantic___
[A]often
[B]usually
选A,但B为什么不行?
ps:
shall表示将来时,可以用在 A and B 后面么.我知道他是可以在I,we后面的.

often 和 usually有什么区别?那个表示频率更高一些?It has sailed across the Atlantic many times .It has sailed across the Atlantic___[A]often[B]usually选A,但B为什么不行?ps:shall表示将来时,可以用在 A and B 后面么.我知
often 的频率比usually高.它们表示一般现在时.一般不与shall一起用.在这道题目中,为了表达many times 的高频率的意思应选择often.它更接近正确.

often是经常的意思,usually是有时的意思,有很大的不同.
It has sailed across the Atlantic many times . It has sailed across the Atlantic___
如果填usually的话,意思就是它有时航行穿越大西洋,与上文many times不符.
shall表将来时当然不能用了.